Author
Topic: Blower motor is... blown (Read 6750 times)

I recently had a guy come out to look at my HVAC unit. He said that my blower motor might be going bad and my contactor and my condenser fan motor were caput then generously offered to fix it for me for 1500 dollars

I found a granger and purchased both parts for $91.00 and installed them myself.

I slip in the breaker and the whole thing come on purring like a kitten. At this point I go into my house and feel cool air coming out of the vents.

Here comes the problem.

Suddenly I hear a muffled bang and smell an electrical fire. I go to my AC and the thing is still running but the blower motor is now not moving.

I purchase a replacement thinking that its the motor just going out and put in in for $70.00. I slip in the breaker and the whole thing comes on. Im sitting in front of the open panel that the blower motor is in and i hear a muffled explosion and see fire inside the blower motor!

I'm assuming that there is something wrong with the way I wired it. I'm almost positive that I put the wires on exactly how they were on the original parts.

I did get a new matching capacitor and I made sure that all of the specifications on the motor were the same.

Is it possible that the contactor has something to do with it? or that two different speeds are trying to go on at the same time and shorting the motor?

I tested the voltage on the board for the cold hot and com lines. both Hot and Com read 121 volts but the cold was showing 4v max. Is my board bad?

Also I plugged in a new motor with only cold wired to a speed = nothing happens.

I wired up hot to a speed and my motor turned on but was making bad noises and started to smell. The motor was being burnt out! I pulled the breaker before it could go to far.

Do you have gas or electric heat? If you have electric heat then maybe you are installing a 120 volt motor when you need a 240 volt motor?

« Last Edit: October 29, 2008, 10:07:58 PM by JWWebster »

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I have never heard of 220 volt blower motors for gas heat. Sorry New stuff to me.

« Last Edit: October 29, 2008, 10:34:53 PM by JWWebster »

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May the hinges of our friendship never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.I love fan letters! LOL

The new motor should use only black HI and common (white or purple) All other wires need to be individually taped off away from each other and not touching anything. 2 browns should be connected to capacitor and it should be taped off too.You have electric heat. That only requires one speed for both ac and heat. All other speeds are not needed.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.I love fan letters! LOL